-R i.e Recursive permissions.But I would suggest not to give 777 permission to all folder and it's all contents. You should give specific permission to each sub-folder in www directory folders.
755 permission for security reasons to the web folder.sudo chmod -R 755 /www/store
Each number has meaning in permission. Do not give full permission.
N Description ls binary
0 No permissions at all --- 000
1 Only execute --x 001
2 Only write -w- 010
3 Write and execute -wx 011
4 Only read r-- 100
5 Read and execute r-x 101
6 Read and write rw- 110
7 Read, write, and execute rwx 111
If your production web folder has multiple users, then you can set permissions and user groups accordingly.
More info :